Furnace.



G. E. ROSE, E. P- BRADSTRUM & O U. GRANT.

FURNACE.

APPLICATION FILED MAR. 21. l9l6.

1 2; 9,66% Patented Mar. 20, 1917.

2 SHEETSSHEET I.

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G. E. ROSE, E. P. BRADSTRUM & 0. U. GRANT.

FURNACE.

APPLICATION FILED MAR.21, 1916.

1,219,664. Patented Mar. 20, 1917.

2 SHEETS-SHEET 2- //7 z/ex z f0 l S Fi 4 f Lose EZQGKE Brnosfrum UNITSTAT% AE UFFIQ GUSTAF E. ROSE, EINER P. BRADSTRUM, AND ORA U. GRANT, OFSPARTA, MICHIGAN.

FURNACE.

Specification of Letters Patent.

Patented Mar. 20, 19117.

Application filed March 21, 1916. Serial No. 85,627.

To all whom it may concern:

Be it known that we, GUs'rAF E. Ross, EINER I BRADSTRUM, and ORA U.GRANT, citizens of the United States of America, residing at Sparta,.inthe county of Kent and State of llfichigan, have inventcdcertain new anduseful Improvements in Furnaces; and we do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same.

This invention relates to a furnace, and it is an object and purposethereof to provide a furnace of the horizontal type in which theproducts of combustion may be carried back and-forth through a 'adiatingdrum so. that a very large percentage of heat from said products ofcombustion will be given off to the hot air chamber of the furnace. Afurther object of the invention consists in the provision of a novelheat insulating space around the furnace through which air passing tothe hotair chamber may be drawn, this air as it passes through the spacereceiving the heat which would otherwise be lost to the outside. Manyother objects and purposes consisting in a novel construction of firebox, novel means for carrying air down on to the fire and in many andvarious details of structure for the economical production of thefurnace will be apparent as the description progresses of the preferredembodiment of our invention shown in the accompanying drawings, inwhich:

Figure 1 is a section taken upon the line 1-1 of Fig. 2. r

Fig. 2 is a longitudinal section taken centrally of the furnace.

Fig. 3 is a vertical section on the line 3--3 of Fig. 2; and

Fig. 4 is a front view of the furnace.

Like reference characters refer to like parts throughout the severalviews of the drawings.

In the construction of the furnace, front and rear supporting plates 1and 2 are provided, the former having a rib 3 at its edges projecting tothe rear while the latter has a similar rib 4 at its edges projectingforwardly, these ribs serving as a-support for the ends of a curved drum5 under which the products of combustion pass. A fire box and ash pitconstruction is located at the forward and lower end of the furnaceimmedi- 2 of the furnace.

ately back of the plate 1, there being an opening in this plate for thepassage of fuel to the fire box. This construction includes a base 6from which at each side project upwardly the sides 7. An irregularshaped member 8 of the same length as sides 7 is positioned directlyabove the upper edge of each side, its upper end curving inwardly asshown at 9 while at a plurality of points in the length outwardlyextending cars 10 are formed, the lower edges of the drum 5 cominginside of these cars and being secured thereto permanently in anysuitable manner. The back of the ash pit and fire box is formed by'aplate 11. Between this plate and the rear member 2 a pair of upper bars12 in alinement with the members 8 are provided and are fastenedsecurely in place,

:these serving asa support for the cross member 13 located back of thefire box and between it and the rear member 2, the plate forming ineffect a fioor for the chamber through which the products of combustionpass. Ears 14 similar to the cars 10 project upwardly and outwardly fromthe bars 12 and that portion of the drum 5 back of the fire box isconnected to said ears.

The fire box proper which holds the burning fuel is located within thesides 7 and comprises sides 15 near the lower edges of which is locateda grate 16 of any suitable formation. Bars 17 interposed between themembers 15 and 7 serve to support said sides 15 with spaces 18 betweenthe sides 7 and 15.

Attached adjacent the edges of each of the members 1 and 2 are rings 1!)Z-shaped in cross section 'whi ch at their outer edges serve as asupport for a drum 20 of thin metal, the

lower edges of which are extended downwardly terminating short of eachside of the sides 7, said drum being fastened securely to the front andrear supports 1 and Between the fire box and the rear of the furnace arepositioned upright thin lower bars 21, a space 22 being left between thelower edges of the drum and said lower bars and the sides 7 of the ashpit through which air may pass into the space 22 between the drums 5 and20, it being apparent that this space is lapted to receive heat throughthe walls 5 to heat the air therein which, drawn through the openings22, passes out through the furnace pipes 24: and is carried by anysuitable conduits to rooms of the dwelling in which the furnace isinstalled. In order that the prod ucts of combustion shall transfer allthe heat possible through the drum 5 to this hot air space a partitionor fine 25 is located above the fire box and runs from the front end ofthe drum to a point near the rear end being then turned down asindicated at 26. Similarly an upper horizontal fine 27 leads from therear support "2 to adjacent the front support, there however, being lefta space for the passage of the products of combustion which going firstfrom the fire box pass under the partition 25, then around its rear endand under the partition 27, then around its front end and between saidpartition 27 and the upper side of the drum and thence through theoutlet 23 which leads to the chinmey. it cleanout member 21) is securedto the rear face of the support 2 being normally closed by a door 30and, through an opening 31 which communicates with the space above thepartition 27, any soot or the like may be readily witlnlrawn. Similarlythere is a clean-out 32 at the front end above the partition 25 whichclosed by doors 33, an opening 3i through the front support 1 permittingaccess to the combustion chamber above both partitions 25 and 27.

Entrance to the fire box is ha d through the opening 35 normally closedby a furnace door 36. There is similarly an entrance to the ash pitthrough the door 37 and directly above the ash pit door a sliding draft38 is provided through which air may pass into the spaces 18 beingthence directed downwardly by the curved ends 9 on to the fire above thegrate 1.6. The entire front of the furnace may be formed by a casting 39in which the various openings and 35 are made, on which the variousdoors 33, 36 and 37 are mounted and in which the sliding draft 38 ispositioned.

Spacing rings 40 and 41 extend outwardly from the members 19 and serveto position an inclosing drum l2, the lower ends of which are broughtdown against the sides 7 and the plates 21 heretofore described, beingfastened thereto as indicated at &3, this leaving a narrow space 44between the outer drum l2 and the drum 20 which incloses the hot airspace. Passages 15 lead into this space from points in the drum 42 belowthe furnace pipes 24: and air may be drawn therethrough, warmed as itpasses over the drum 20 and carried through the openings '22 to the hotair chamber 23, it being evident with this construction that none of theheat is lost by radiation into the basement where a furnace is installedbut that such heat is utilized to warm. the air which passes to thefurnace fire.

A furnace of this character is especially easy to manufacture andassemble having no complicated parts to be cast or finished. The passageof the products of combustion back and forth through the drum 5 causesan especially large amount of radiation to the hot air chamber. Theheating of the air passing to the hot air chamber is yet another sourceof economy which makes the furnace especially economical in use. Manyminor details of structure may be changed without departing from theinvention defined in the appended claims and accordingly we considerourselves entitled to all modifications of structure falling within thescope of the appended claims, which define the invention.

We claim 1. In a furnace, an ash pit comprised of a base, upwardlyextending sides and a back, a fire box located above the base andcomprised of sides spaced from the sides of the ash pit and a grate,front and rear supporting plates, upper and lower bars interposedbetween the back of the ash pit and the rear supporting plate, a drumlocated between and supported by said plates, connections between thelower edges of the drum and the upper bars and ash pit, a floor betweenthe upper bars completing the combustion chamber, an air inclosing drumaround and spaced from the first drum, means closing the openings at theends of said drums to thereby form an air chamber, and means forconducting the heated air away from the air chamber.

2. In a furnace, an ash pit comprised of a base, upwardly extendingsides and a back, a fire box located above the base comprised of sidesspaced from the sides of the ash pit and a grate, extensions to thesides of the ash pit curved inwardly over the fire box, means to enterair into the spaces between the sides of the fire box and ash pit, adrum to carry the products of combustlon, an outlet thereto, an air drumsurrounding said first drum and fire box and conduits leading therefrom.

i 3. In a furnace, a fire box and ash pit, a

horizontally positioned drum covering said fire box and ash pit andextending to the rear thereof and adapted to receive products ofcombustion, front and rear supporting plates for the drum, bars betweenthe ash pit and rear support to which the drum is secured, at floorclosing the space between the bars, a flue located across the drum andextending from the front support to adjacent the rear support and havinga down turned rear end, a similar flue within the first flue projectingfrom the rear support to adjacent the front support, an air inclosingdrum surro'lniding the inner drum, means to conduct the combustionproducts from the inner drum, and means to conduct heated air from theair inclosing drum, substantially as described.

4. In a furnace, front and rear supports, an ash pit and fire boxconstruction located back of the front support including a base,

sides and back with a grate supported above the base, upper and lowerbars between the back of said fire box construction and the rear supportat each side of the ash pit, a floor supported between the upper bars, adrum supported at its ends by said front and rear supports and havingedges turned downwardly and connected to the sides of the fire box andsaid upper bars, a ring of substantially Z- shaped cross section securedto and projecting to the front and rear of the front and rear supports,respectively, a drum inclosing an air space supported at the ends bysaid rings and turned to bring its edges adjacent but spaced from thesides of the ash pit and said lower bars, means to secure the drum inplace, a member provided with openings leading into the fire box and ashpit secured in front of the front support and doors to said openmgs.

5. In a furnace, a fire box, an ash pit having sides spaced from thefire box and extended above and turned inwardly over the sides of thefire box, a horizontal drum to receive products of combustion from thefire box, a drum inclosing the fire box and said first drum, a memberprovided with Copies of this patent may be obtained for five cents each,by addressing the Commissioner of Patents,

openings leading to the fire box and ash pit and to the spaces betweenthe sides of the ash pit and fire box secured at the front of thefurnace, doors to said openings to the fire box and ash pit, and amovable closure for the openings leading to said spaces between the firebox and ash pit.

6. In a furnace, a fire box and ash pit, a drum to receive the productsof combustion from the fire box, a flue extending from the front of thedrum to adjacent the rear thereof and having a down turned rear end, aflue above and within the first flue secured to the drum and having itsfront end terminating short of the front of the drum, an outletcommunicating with said last mentioned fine to carry away the productsof combustion, a drum in'closing an air space between it and the firstdrum, and an outer drum in'closing an air space between it and saidsecond drum, said air space communicating with the space between theinner and second drums.

In testimony whereof we afiix our signatures.

GUSTAF E. ROSE. EINER P. BRADSTRUM. ORA U. GRANT.

Washington, D. G.

